The family of Las Vegas casino magnate Sheldon Adelson is putting its second $5 million cash infusion into a “SuperPAC” supporting former House Speaker Newt Gingrich for the Republican presidential nomination.

Jon Ralston of the Las Vegas Sun, who breaks most political stories in Nevada, reports that $5 million will come from Dr. Miriam Adelson. Sheldon Adelson gave the first $5 million, a $3.4 million chunk of which was spent in the South Carolina primary.

The Adelsons have virtually dealt Gingrich back into the presidential race.

The $5 million donations — largest by a single giver in the history of presidential politics — were made possible by the U.S. Supreme Court’s 2010 corporations-are-people “Citizens United” ruling.

Under campaign rules, the Adelsons could legally give $5,000 to Gingrich, or perhaps hit up friends and “bundle” $100,000 or $200,000 in donations. With the SuperPACs, supposedly independent of the candidate, they can made a thousand-times-greater donation.